The CM-2 camera mounting plate is designed for use with certain Mamiya cameras. It works with the RB/RZ series as well as the twin lens C330/C220 cameras. It is also meant to be used with the 645 series of cameras that only have interchangeable inserts not backs.
Note:Works with 645 series on QRS, QRS-AF, QRS-EV,QRS-SV - Works with Rb/RZand C330/C220 on QS.